ETC ETC Construction Methods & Field Operations

Question 1

What is the purpose of a shoring system during excavation?

Accepted Answer

To support the walls of an excavation and prevent collapse

Answer

Shoring systems support the sides of an excavation to prevent cave-in and protect workers from soil collapse.

Question 2

What does the term 'subgrade' refer to in road construction?

Accepted Answer

The native or prepared soil layer below the pavement structure

Answer

Subgrade is the compacted native or improved soil layer that forms the foundation for the pavement structure above.

Question 3

What is the purpose of a slump test for concrete?

Accepted Answer

To assess the workability and consistency of fresh concrete mix

Answer

The slump test measures how much a cone of fresh concrete settles under its own weight, indicating its workability and water content.

Question 4

What is the function of rebar in concrete structures?

Accepted Answer

To provide tensile strength that concrete lacks on its own

Answer

Rebar provides tensile and flexural strength to concrete, which is strong in compression but weak in tension.

Question 5

What does compaction of fill material achieve in construction?

Accepted Answer

Increases soil density and bearing capacity while reducing future settlement

Answer

Compaction increases the dry density of soil by reducing air voids, improving load-bearing capacity and minimizing future settlement.

(ETC) Engineering Technician Certification Practice Test